Sharp R-1405 Service Manual
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Sharp R-1405 Service Manual

Over the range microwave oven
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R-1405
BEFORE SERVICING ...................................................................................................... INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL ................................................................................................................ 1
MICROWAVE MEASUREMENT PROCEDURE .....................................................................................................2
FOREWORD AND WARNING ................................................................................................................................3
PRODUCT SPECIFICATIONS ............................................................................................................................... 4
GENERAL INFORMATION ...................................................................................................................................4
OPERATION .........................................................................................................................................................7
TROUBLESHOOTING GUIDE ............................................................................................................................. 11
TEST PROCEDURE ............................................................................................................................................ 13
TOUCH CONTROL PANEL ASSEMBLY ............................................................................................................. 22
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE .................................................................. 26
PICTORIAL DIAGRAM ........................................................................................................................................ 34
POWER UNIT CIRCUIT ....................................................................................................................................... 35
LSI UNIT CIRCUIT ............................................................................................................................................... 36
PRINTED WIRING BOARD ................................................................................................................................. 37
PARTS LIST ........................................................................................................................................................ 38
PACKING AND ACCESSORIES ......................................................................................................................... 40
SHARP CORPORATION
SERVICE MANUAL
OVER THE RANGE
MICROWAVE OVEN
MODELS
In the interest of user-safety the oven should be restored to its original
condition and only parts identical to those specified should be used.
WARNING TO SERVICE PERSONNEL: Microwave ovens con-
tain circuitry capable of producing very high voltage and
current. Contact with the following parts may result in a
severe, possibly fatal, electrical shock. (High Voltage Capaci-
tor, High Voltage Power Transformer, Magnetron, High Volt-
age Rectifier Assembly, High Voltage Harness etc..)

TABLE OF CONTENTS

This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
1
S92M198R1405E
R-1405
R-1406
R-1405
R-1406
Page

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  • Page 1: Table Of Contents

    R-1405 R-1406 SERVICE MANUAL S92M198R1405E OVER THE RANGE MICROWAVE OVEN R-1405 MODELS R-1406 R-1405 In the interest of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used. WARNING TO SERVICE PERSONNEL: Microwave ovens con- tain circuitry capable of producing very high voltage and current.

  • Page 2: Precautions To Be Observed Before And During Servicing To Avoid Possible Exposure To Excessive Microwave Energy

    Before servicing an operative unit, perform a microwave emission check as per the Microwave Measurement Procedure outlined in this service manual. If microwave emissions level is in excess of the specified limit, contact SHARP ELECTRONICS CORPORATION immediately @1-800-237-4277. If the unit operates with the door open, service person should 1) tell the user not to operate the oven and 2) contact SHARP ELECTRONICS CORPORATION and Food and Drug Administration's Center for Devices and Radiological Health immediately.

  • Page 3: Warning To Service Personnel

    R-1405 R-1406 WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of pro- ducing very high voltage and current, contact with following parts may result in a severe, possibly fatal, electrical shock. (Example) High Voltage Capacitor, High Voltage Power Trans- former, Magnetron, High Voltage Rectifier Assem- bly, High Voltage Harness etc..

  • Page 4: Microwave Measurement Procedure

    R-1405 R-1406 MICROWAVE MEASUREMENT PROCEDURE A. Requirements: 1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed 1mW/cm at any point 5cm or more from the external surface of the oven, measured prior to acquisition...

  • Page 5: Foreword And Warning

    OVER THE RANGE MICROWAVE OVEN R-1405/ R-1406 GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. OPERATION Service Personnel with Operation and Service Information for the SHARP OVER THE RANGE MICROWAVE OVEN, R-1405 and R- 1406.

  • Page 6: Product Specifications

    R-1405 R-1406 PRODUCT SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 13.5 Amperes 60 Hertz Single phase, 3 wire grounded Power Output 950 watts (IEC TEST PROCEDURE) Operating frequency of 2450MHz Case Dimensions Width 29-15/16" Height 15- 9/16" Depth 16-1/4"...

  • Page 7: Oven Diagram

    R-1405 R-1406 Electrical Requirements The oven is equipped with a 3-prong grounding plug. DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE GROUNDING PIN FROM THE PLUG. The power supply cord and plug must be connected to a separate 120 Volt AC, 60 Hz, 15 Amp. or more dedicated line, using a grounded receptacle.
  • Page 8 R-1405 R-1406 CONTROL PANEL NOTE: Some one-touch cooking features such as "MINUTE PLUS" are disabled after three minutes when the oven is not used. These features are automatically enabled when the door is opened and closed or STOP/CLEAR button is...

  • Page 9: Operation

    R-1405 R-1406 OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during relay (RY2) and is mechanically associated with the door oven operation. so that it will function in the following sequence. (1) When the door opens from a closed position, the...
  • Page 10 R-1405 R-1406 VENTILATION METHODS HOT AIR EXHAUST 1. VERTICAL VENTING For this venting method, hot air rising from the conventional range below is drawn in by the hood fan motor through the grease filters at the right and left sides of the base cover,...
  • Page 11 R-1405 R-1406 SCHEMATIC NOTE: " " indicates components with potential above 250V. NOTE: CONDITION OF OVEN 1. DOOR CLOSED. CLOCK APPEARS ON DISPLAY. CAVITY MAGNETRON THERMAL TEMPERATURE CUTOUT FUSE CONTROL UNIT N.O. COM. FUSE POWER DOOR TRANSFORMER SENSING SWITCH HOOD FAN...
  • Page 12 R-1405 R-1406 DESCRIPTION AND FUNCTION OF COMPONENTS 3. If the door is opened, and the secondary interlock relay DOOR OPEN MECHANISM (RY2) and primary interlock switch contacts fail to open, The door is opened by pushing the open button on the control the monitor fuse blows simultaneously with closing of the panel, refer to the Figure D-1.

  • Page 13: Troubleshooting Guide

    R-1405 R-1406 vapors given off from the heating foods. It is then exhausted supplied duct system, or discharged back into the kitchen. through the exhausting air vents at the oven cavity. HOOD LAMP HOOD FAN MOTOR The hood lamps are mounted at the hood lamp angle on the The hood fan motor is a one-speed, single-phase, double pole base cover.
  • Page 14 TEST PROCEDURE PROBLEM CONDITION Home fuse blows when power cord is plugged into wall receptacle. Monitor fuse blows when power cord is plugged into wall receptacle. Display does not illuminate when power cord is first plugged into wall receptacle. Display does not operate properly when STOP/CLEAR button is touched. (The time of day should appear on the display with beep sound during normal condition.) CONDITION...

  • Page 15: Test Procedure

    R-1405 R-1406 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MAGNETRON ASSEMBLY TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check across the magnetron filament leads should indicate less than 1 ohm.
  • Page 16 R-1405 R-1406 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE.) HIGH VOLTAGE RECTIFIER TEST 1. Disconnect the power supply cord, and then remove outer case.
  • Page 17 R-1405 R-1406 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 6. Reinstall the outer case (cabinet). 7. Reconnect the power supply cord after the outer case is installed. 8. Run the oven and check all functions. CAUTION: IF THE THERMAL CUT-OUT OR TEMPERATURE FUSE INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, REPLACE THERMAL CUT-OUT OR TEMPERATURE FUSE.
  • Page 18 R-1405 R-1406 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER plate of the oven cavity with the door opened (in this condition the plunger of the monitor switch is pushed in), the meter should indicate an open circuit. If improper operation is indicated, the switch may be defective.
  • Page 19 R-1405 R-1406 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Resistance between; BLU (1) YLW (4) = (Shorted) BLK (2) YLW (4) = 60 HOOD FAN BLU (1) BLK (2) = 60 CAPACITOR RED(5) BLU (1) = 162 120 v MAIN 60 Ω...
  • Page 20 R-1405 R-1406 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER TOUCH CONTROL PANEL ASSEMBLY TEST The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter and ohmmeter.
  • Page 21 R-1405 R-1406 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER When testing is completed, 1) Disconnect the power supply cord. 2) Open the door and block it open. 3) To discharge high voltage capacitor, wait for 60 seconds. 4) Reconnect all leads removed from components during testing.
  • Page 22 R-1405 R-1406 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 7. After that procedure, re-connect the power supply cord. 8. Check voltage between normal open terminal of the relay RY2 and the normal open terminal of the relay RY1 on the control unit with an A.C. voltmeter.
  • Page 23 R-1405 R-1406 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER STEPS OCCURRENCE CAUSE OR CORRECTION Only pattern at "a" is broken. *Insert jumper wire J1 and solder. Pattern at "a" and "b" are broken. *Insert the coil RCILF2003YAZZ between "c" and "d".

  • Page 24: Touch Control Panel Assembly

    R-1405 R-1406 TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units Symbol Voltage Application as shown in the touch control panel circuit. -5.3V LSI(IC1) (1) Key Unit 3) Synchronizing Signal Circuit...
  • Page 25 R-1405 R-1406 Pin No. Signal Description Back light circuit (Light emitting diodes) driving signal. To input signal which communicates the door open/close information to LSI. Door close "H" level signal (0V). Door open "L" level signal (-5V). 9-10 AN1-AN0 Terminal not used.
  • Page 26 R-1405 R-1406 Pin No. Signal Description Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one of G7 line keys on key matrix is touched. Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one of G6 line keys on key matrix is touched.
  • Page 27 R-1405 R-1406 SERVICING 1. Precautions for Handling Electronic Components 4) Re-install the outer case (cabinet). This unit uses CMOS LSI in the integral part of the 5) Re-connect the power supply cord after the outer case circuits. When handling these parts, the following is installed.

  • Page 28: Component Replacement And Adjustment Procedure

    4. If the outer case (cabinet) is not fitted. WARNING FOR WIRING To prevent an electric shock, take the following pre- 3) Sharp edge: cautions. Bottom plate, Oven cavity, Waveguide flange, 1. Before wiring, Chassis support and other metallic plate.
  • Page 29 R-1405 R-1406 5. Pull the hood exhaust louver from the oven cavity by Left tab pushing the right and left tabs of the hood exhaust louver Hood exhaust louver to remove. Screw Right tab 6. Now, the hood exhaust louver is free.
  • Page 30 R-1405 R-1406 4. Disconnect the 6-pin connector of the hood fan motor 5. Remove the hood fan motor from the oven cavity top from the main wire harness located at the right edge of plate by lifting it up. the oven cavity top plate and release the snap band from 6.

  • Page 31: Cooling Fan Motor Removal

    R-1405 R-1406 TEMPERATURE FUSE (MAGNETRON) REMOVAL 1. Disconnect the power supply cord and remove the oven referring to the procedure of " COOLING FAN MOTOR from wall and remove outer case. (Refer to procedure of REMOVAL". "Removal of Oven from Wall" and "Outer case Removal") 5.
  • Page 32 R-1405 R-1406 TURNTABLE MOTOR AND FOOD LAMP SOCKETS REMOVAL 1. Disconnect the power supply cord. TURNTABLE MOTOR 2. Open the door and block it open. 9. Disconnect the wire leads from the turntable motor. 3. To discharge the high voltage capacitor, wait for 60 10.Remove one (1) screw holding turntable motor to the...
  • Page 33 R-1405 R-1406 13.Remove the two (2) screws holding the LCD holder to 2. Before attaching a new key unit, wipe off remaining the key fixing plate. adhesive on the key fixing plate surfaces completely with 14.Remove two (2) screws holding the power unit to the key a soft cloth soaked in alcohol.
  • Page 34 R-1405 R-1406 After adjustment, check the following. Latch heads 1. In and out play of door remains less than 0.5mm when in Latch hook the latched position. First check upper position of latch hook, pushing and pulling upper portion of door toward the oven face.
  • Page 35 R-1405 R-1406 DOOR DISASSEMBLY 1. Disconnect the power supply cord. DOOR FRAME ASSEMBLY 2. Open the door and block it open. 11.Remove two (2) screws holding the door panel to the 3. To discharge the high voltage capacitor, wait for 60 door frame assembly.

  • Page 36: Pictorial Diagram

    R-1405 R-1406...

  • Page 37: Power Unit Circuit

    R-1405 R-1406 D1-D4 1N4002 – R1 390 2w R2 750 1w – AC(N) 10µ/35v OVEN LAMP OVEN LAMP TURNTABLE TURNTABLE MOTOR MOTOR FAN MOTOR FAN MOTOR KRC243M AC(H) BUZZER PKM22EPT MICRO. MICRO. N.C. HOOD HOOD MOTOR THERMAL COM. CUT-OUT HOOD MOTOR COM.

  • Page 38: Lsi Unit Circuit

    LIQUID CRYSTAL DISPLAY CPU UNIT LBS. DTA143EKA CUPS. KGOZ. – R6 4.7k 2SA1037AK COOK DEFROST SENSOR AUTO % KTA1661 N.C. H. MOTOR COM. Q24 DTA143EAK HOOD LAMP SEG8 SEG8 SEG9 SEG9 SEG10 Q25 DTA143EAK SEG10 SEG11 SEG11 LD1 LD2 LD3 LD4 SEG12 SEG12 SEG13...

  • Page 39: Printed Wiring Board

    R-1405 R-1406 CN-C CN-E CN-A CN-B Figure S-4. Printed Wiring Board...

  • Page 40: Parts List

    Outer case cabinet [R-1405] 2- 5 GCABUB105MRP0 Outer case cabinet [R-1406] 2- 6 TMAPCB074MRR0 Schematic diagram 2- 7 FANGKB009MRY0 Hood lamp glass assembly [R-1405] 2- 7 FANGKB010MRY0 Hood lamp glass assembly [R-1406] 2-7-1 LANGQB016MRP0 Hood lamp glass angle [R-1405] 2-7-1 LANGQB020MRP0...
  • Page 41 REF. NO. PART NO. § DESCRIPTION Q'TY CODE 3- 2-2 JBTN-B141MRF0 Open button [R-1406] 3- 2-3 HPNLCB172MRF0 Control panel frame [R-1405] 3- 2-3 HPNLCB173MRF0 Control panel frame [R-1406] 3- 2-4 MSPRTA050WRE0 Button spring 3- 3 XEPSD30P10XS0 Screw; 3mm x 10mm...

  • Page 42: Packing And Accessories

    1. MODEL NUMBER 2. REF. NO. 3. PART NO. 4. DESCRIPTION Order Parts from the authorized SHARP parts Distributor for your area. Defective parts requiring return should be returned as indicated in the Service Policy. PACKING AND ACCESSORIES 4-3 TURNTABLE TRAY...
  • Page 43 R-1405 R-1406 OVEN AND CABINET PARTS 6-1-5 6-11 4-10 4-12 1-12 4-19 1-14 4-17 4-16 4-18 4-13 4-17 4-16 1-15 4-20 4-13 4-15 4-11 1-16 1-13 1-10 1-11 4-21 1-11 4-14 4-22 1-10 1-13 1-16 6-10 2-7-2 6-10 2-7-1...

  • Page 44: Control Panel Parts

    R-1405 R-1406 CONTROL PANEL PARTS 3-1-2 3-1-1 3-2-1 DOOR PARTS 3-2-3 3-2-2 3-2-4 5-2-1 5-2-2 MISCELLANEOUS 6-1-1 6-1-4 6-1-5 6-1-2 6-1-6 6-1-7 Actual wire harness may be different from illustration. 6-1-3 6-1-8...
  • Page 45 R-1405 R-1406 NOTES...
  • Page 46 R-1405 R-1406 NOTES...
  • Page 47 R-1405 R-1406 NOTES...
  • Page 48 No part of this publication may be reproduced, stored in retrieval systems, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permis- sion of the publisher. '02 SHARP CORP. (9S2.420E) Printed in U.S.A...

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